Granted Patent
Utility
US 4,154,446 · App. 05/873,665
High temperature rotary joint
Inventor:
Joe D. Usry
Patented Case
View Patent ↗
Granted: May 15, 1979
Filed: Jan 30, 1978
Inventor
Joe D. Usry
Assignee (at issue)
E-Systems, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.